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Ultrastructure of spermatogenesis and spermatozoom in Pollicipes mitella (Cirripedia)(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
Vol.09 No.4
Page:
417-421
Research Field:
Reviews
Publishing date:

Info

Title:
Ultrastructure of spermatogenesis and spermatozoom in Pollicipes mitella (Cirripedia)
Author(s):
LIN Ganget al.
Keywords:
Keywords Pollicipes mitella spermatogenesis spermatozoon ultrastructure
CLC:
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PACS:
DOI:
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DocumentCode:

Abstract:
Abstract The ultrastructure of spermatogenesis and spermatozoon of Pollicipes mitella was studied. The spermatogenesis is a kind of metamorphosis. During the spermiogenesis, a cell changes from polygon to pearshape and springs to be threadlike.An ellipsoidal nucleus becomes elongated and is bended to a “U”shape,to a filiform shape finally. The accessory droplet emerging in a middle spermatid becomes "U"shape too, and columnar at the end.A nuclear vesicle and microtubules surrounding the nucleus appear at the spermatid,but they disappear in mature sperm. In mature sperm. The mature spermatozoon is a very long cell (36 μm)with a accessory droplet,consisting of four parts: acrosome,neck,middle piece and tail.The acrosome(0.6 μm long) is a conical vesicle. Axoneme comes out from the basal bady behind the acrosome. The nucleus(16 μm long) begining on the acrosome basis has a filiform shape with very dense material.The accessory droplet(8 μm long) is a very prominent feature containing a long and central dense structure.The nucleus,the accessory droplet and the axoneme occupy the middle piece of the sperm.The flagellum is a standard “9+2” microtubular pattern. Fig 1,Plate 2,Ref 11

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Last Update: 2001-08-26